Porosity production in weathered rock: Where volumetric strain dominates over chemical mass loss

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dc.contributor.authorHayes, Jorden L.en
dc.contributor.authorRiebe, Clifford S.en
dc.contributor.authorHolbrook, W. Stevenen
dc.contributor.authorFlinchum, Brady A.en
dc.contributor.authorHartsough, Peter C.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2020-02-04T02:18:38Zen
dc.date.available2020-02-04T02:18:38Zen
dc.date.issued2019en
dc.date.updated2020-02-04T02:18:31Zen
dc.description.abstractWeathering in the critical zone causes volumetric strain and mass loss, thereby creating subsurface porosity that is vital to overlying ecosystems. We used geochemical and geophysical measurements to quantify the relative importance of volumetric strain and mass loss—the physical and chemical components of porosity—in weathering of granitic saprolite of the southern Sierra Nevada, California, USA. Porosity and strain decrease with depth and imply that saprolite more than doubles in volume during exhumation to the surface by erosion. Chemical depletion is relatively uniform, indicating that changes in porosity are dominated by processes that cause strain with little mass loss. Strain-induced porosity production at our site may arise from root wedging, biotite weathering, frost cracking, and the opening of fractures under ambient topographic stresses. Our analysis challenges the conventional view that volumetric strain can be assumed to be negligible as a porosity-producing mechanism in saprolite.en
dc.description.sponsorshipJ.L.H., C.S.R., W.S.H., and B.A.F. were supported by NSF EPS-1208909. C.S.R. and P.C.H. were supported by NSF EAR-1331939. J.L.H. acknowledges support from Dickinson College Research and Development.en
dc.description.sponsorshipNSFNational Science Foundation (NSF) [EAR-1331939, EPS-1208909]; Dickinson College Research and Developmenten
dc.description.versionPublished (Publication status)en
dc.format.extentPages eaao0834-eaao0834en
dc.format.mimetypeapplication/pdfen
dc.identifiereaao0834en
dc.identifier.doihttps://doi.org/10.1126/sciadv.aao0834en
dc.identifier.eissn2375-2548en
dc.identifier.issue9en
dc.identifier.orcidHolbrook, Steven [0000-0003-0065-8841]en
dc.identifier.pmid31555724en
dc.identifier.urihttp://hdl.handle.net/10919/96699en
dc.identifier.volume5en
dc.language.isoenen
dc.publisherAAASen
dc.rightsCreative Commons Attribution-NonCommercial 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/en
dc.titlePorosity production in weathered rock: Where volumetric strain dominates over chemical mass lossen
dc.title.serialScience Advancesen
dc.typeArticle - Refereeden
dc.type.otherArticleen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciences/Durelle Scotten
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciencesen
pubs.organisational-group/Virginia Tech/University Research Institutesen

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